they are square drive finishing screws, and are used for finishing. They are used in place of finishing NAILS. The diameter of the head is small like the head on a finishing nail. For the head to be made on this screw a standard philips drive would not be large enough to provide the needed torque to drive the screw properly thus a square drive head is used to provide the grip and keep the head in the needed cofiguration.
start square, finish square
Last edited by delroy33; 05-11-2005 at 09:29 AM.